Transmission



Feb. 16, 1960 D. F. MCFARLAND 2,924,984

TRANSMISSION 3 Sheets-Sheet l Filed April 3, 1959 vland ven-Pot* ou la??? F l? @5mm/gf Feb. 16, 1960 D. F. WFARLAND 2,924,984

' TRANSMISSION v Filed April 3, v1959 3 Sheets-Sheet 2 .firman or* @Payless Mcfgrancl "Wr v fg M@ #j l @Bronte Feb. 16, '1960 D. F. MCFARLAND 2,924,984

TRANSMISSION Filed April 3. 1959 3 Sheets-Sheet 3 @i Je www @2m/f M52@ f@ @www f Douglas F. McFarlane, Davia. city, Iowa avna-1aisffaif A 804,112.2 i ricains. (ol 7,4-,364). 10

tipa iS t0 nrovideaxmultilf .is

Vnvention is to', provide v `pqyvertluri Thot have will., bs, apparaat, t9.fh se.

C011 tlctiqn; arrange `rts of, the dee'ffattainedfas "ally P Qintedj out many-ing. drav Smisionr" v v' W Qfbne 0f multi Ve speed transmission in` ef- .als the gear'A units" of fgtivs Qperatign uni ofbmy multiplespeedtransmission in a non-effec- ?ffgiti., i `l f t 5"sanvertical'seetio al'view of my transmission `takerrpn line' S245: of and` more`v fully illustrates its construction;` J'Fi'gf' 4isa eross-sectionalview of my device taken on 6 of IJiVVSij,` i f l 1g.'7is`a cro s-'sectionalyiew of mydevic'e taken on lig v the hearing,` Wal f 2,924,984 1C Patented Feb. 16, g

2 Eig, 8 is a side view of the brake means taken` from f transmissionmay be used for any purpose where,-

in a multigjea'r ltransl-'mission is needed. It is particularly adapted for motorized vehicles such as tractors, trucks, buses, traclt viel'iicles'4 and automobiles, i

, In the 'drawingsI have used the numeral 10 to desigi nate the transinissitnhousing. The numerals 11. and 12 designate two bearing walls in' the housing. The numeral 13`de`si'gn es thedrivef'shaft rotatably extending into the housingffandf through thetwo bearing walls 11 and 112; ."Ihis sha is"adap'tie dfto; be operatively connected toa primev rny r`.` The n`umer'al.14 designates the driven shaft rotatably eX ,ndinginto the housing and through vl1 1? and-112. This shaft 14 is spaced apart from and` parallelfwith thefshaft 13 as shown in the Rotatalily secured on'the shaft 13 and betw s n tliejbeariugwalls Il and 12 are two spaced apart plate 'gear wheels 15A ,and."`16. "Also rotatably secured on theshaft y133, huthetween, the bearing wall 12 and the sides all of"thefhfolrusing are two spaced apart plate gear l wheelsahd lflf'lhesegear wheels have peripheral gear teethV andy the diameter of the vgear wheel 17 isy greater than` thatof the geanvvheel 16, but less `than that ofthle diameter,` o f: the gearwheel 19. The gear wheell 15i`s the",reverse gear, the' gear wheel 16, the. lout/. gezag,- the` gearjwhee'l 1,7, the intermediate gear andithemgleaii wheel 19'tliel highgearl Any suitable nuimller'to'ff gears'peedsmay be 'used employing my systern;V Rigidlyeciiredfon'the, shaft 14 are the gear wheels` 2 ,21,`22f and", 3, The gear Vwheel 22, is of a diameter less than",thatfofthegear `wheel 21, but greater than that offthlgear wheelfZS. i The numeral 24 designates an idlerl gear?? opferltiYely 'Otatably mounted on the bearing walhll', and havingtits peripheral teeth in mesh with the peripheraltee'th offbotli'` the gear wheels 15 and 20. Thus, when` thefgear wheel` 15r is power driven,` the gear wheel20 will becailsed to rotate in the same direction of rotationand areverse gear` will'jbe realized; The relatively largeA gearwheel 21 has its` peripheral teeth in mesh with, the peripheral teeth of the` relativelyy small gear wheelfl, and when the gear Wheel 16 is power driven, the s haft`13-` willliayea speed rotation greater than that of shaft 14 andl`o,v"k gear will be realized. The gearfwhe'el 22ha's its .peripheral-teeth in mesh with the y peripheral` teeth of the` gear wheel 17, and when the gear wheel 17V is power driven, intermediate gear will be realized. The relatively small diameter gear wheel 23 hays-its peripheral teeth inrnesh with the relatively large diameter gearfwheel 19 and when the gear wheel 19 is power driven, fhig'hh gear will be realized. The operation of'allfthese 4gear, wheelsk relative to each` other is Wellltnown and-my. invention chiey resides in the means ofselectively` securingeach Aofthe, gear wheelsrlS, 16 17 and 1,91tothe shaft 13fagainst independent rotation. On each side of each of the gear wheels 15, 16, 17 and 19 I securelafriction plate 25. These friction plates may be, ofgany suitable1 material such as that of clutch face linersf Rigidly secured to theshaft 13 and adjacent`thje,le ftsideof the gear Wheel 15 is a rigid plate 26. A` similar rigid plate 27 rigidly secured to the shaft 13 is adjacenttheleft side of the gear wheel 16. yAlso a rigid plate29 is rigidly secured to. the shaft 13 and adjacent theileft` sideof the -gear wheel 1'7. The numeral 30 designates a`rigidplat e rigidly secured to the shaft 13 and adjacent the leftfside of thegear Wheel 19.A These rigid plates are longitudinally adjustablevon the shaft 13 y by having threaded collarsgandfset, screws as shown in A similarcup Y32 `is at `their-ight sidetofihegear wheel'16,

by snap rings 3,5 Vas shown in Figr2. In each cup member is a slidable circular open centered disk 36 having an O-ring 37 embracing its outer periphery and an O-ring 37 embracing its inner periphery and engaging the circular walls of its cup as shown in Fig. 4.` That part of the shaft 13 that extends into the housingltl is hollow and slidably extending into the shaft 13 is a hollow shaft 39.

Each of the gear wheel units, as to operation, is a substantial duplicate and by referring to. Figs. 2 and 4 the operation of each of the units will be apparent. Extending through the:base of each cup and the wall of the hollow shaft 13 are a plurality of passageways 50. These back of its circular disk 36. kExtending through the wall of the hollow shaft 39 are four spaced apart sets of passageways 51. These sets of spaced apart passageways are so arranged that when the hollow shaftr 39 is longitudinally slid toits maximummovement vinto the shaft 13, one set of these passageways will communicate with the passageways 50 that communicate with the in- 4 sageways 51'v into the selected passageways S0. In the drawings I show a bar 62 pivoted near its center length to'the housing-10 and having its lower end slidably pivoted to the outer endof vthe hollow shaft. The numeral Y 63 designates a hand lever pivoted between its two ends merely rearranging the position of the various passagef ways 50 and 51. Any suitable position indicating means andV shaft 13 yielding holding means may be used. In passageways communicate with the inside of the cup and the drawings I'use a seriesof circular grooves'65 around L lthey shaft 39 and which'are'selectively engaged by spring loaded pawls 6 6. n' v When the shaft 39 is positioned as shown in Fig. 5, the pump willfbe'furnishing fluid pressure through the hol-Y lo'w shaft'39 through the passageways 51, through the side of the cup 34. When the shaft 39 is slid'outwardly relative to the shaft 13 to its next position, a set of passageways 51 will be in communication with the passageways 50 that are in communication with the inside of the cup 33. A further outward sliding of the shaft 39 brings another set of passageways 51 in communication with the passageway 50 that communicates with the inside of the cup 32. A still further sliding withdrawal of the pipe 39 brings another set of passageways 51 into communication with the passageways 50 that communicate with the inside of the cup 31. The sets of passageways 51 are so arranged and spaced that only one set at a time can operatively communicate with the inside of a cup. Each of the gear wheels 15, 16.17 and'19 may rotate around a bearing ring 54 on the shaft 13. These bearing rings 54 are positioned between the adjacent rigid plate and adjacent cup. The numeral 52 designates passageways through each of these vbearing rings and wall of the hollow shaft 13. Around lthe hollow shaft 39 are four spaced apart reduced areas to provide an elongated longitudinal passageway 53 between the periphery of the hollow shaft 39 and the inside bore of the hollow shaft 13. These four longitudinal passageways 53 are so arrangedand positioned that none is capable of communicating with a given set of passageways 50 and 52 when the given set of passageways 52 is in communication with a set of passageways 51. Thus, after a -gear wheel unit has had its cup furnished with a lluid pressure, and then another gear wheel unit is employed, the fluid pressure in the cup of the first unit` may exit back through the passageways S0, thence through the adjacent passageway 53, thence through the passageways 52 and then seep back into the system. The numeral 55 designates a uid pump having itsrotor rigidly Ysecured to the shaft 39 and its housing secured tothe bearing wall 11. The numeral 56 designates a hydraulic lluid tank sump in the bottom area of the housing 10. The numeral 5 7, designates a conduit leading from the tank 56 to the inlet side of the lluid pump.

Thenumeral` 59 designates a flexible conduit leadingl passageways 50 and yinto thev cup` 32. This hydraulic pressure will V.move the disk 36'of that cup to the left yand thereby wedge the vgear wheel 16 and its friction side plates between the disk and adjacent rigidplate 27. Be-

Any suitable means may be used for changing the cause of the relative sizes of the two gear wheels 16 and 2 1, the transmission willA be in low f gear. AIf the shaft is moved to the right into'ithf next notch, passageways 50 and 51 will communicate with thelinside of the cup 37 and the gear wheel 17 'will therebybe locked to the shaft 13 and intermediate gear will result. By moving the shaft 39 tothe right of the next` notch, hydraulic fluid pressure will be passed into the cup 34 and highl gear will result. If the shaft 39 is moved to the left beyond the low gear notch, the' transmission will be in neutral or .parkland if moved further to the left to the next notch the hydraulic'pressure will enter the cup 31 and reverse gear will result; When hydraulic pressure is denied to lany one of the cups, that cup will move away fromits adjacent rigid plate by the spring washers 70. When the transmission is in neutralit may be desirable to brake the shaft 14. vIshow a brake wheel 71 on the shaft 14 embraced by a movable brake band 72. A brake band actuating lever173 extends from the brake band to the bar. j Ifthe Ahydraulic pump should fail. the handpump 60 may be used in case of an emergency.

The disk plungers 36' should'bev held against independent rotation relative to the cupmembers in which they function. In the drawings I show holding lugs 75 in the cup members and` which slidably extend into the respective disks 36. k Inasmuch as the plunger disks 36 must be substantially tight relative to the innerr and outer wall of the cup members in which they function, they should be provided with the O-rings 37 both at their outer periphery and inner periphery as shown in' Fig. 4. The cup members may be held by any suitable means against independent rotation relative to' theshaft 13 and in the drawings I accomplish this by splining the cup members on the shaft 13 as shown in Fig. 3.

One advantageof my transmission structure is that so many of the various parts are interchangeable, thereby facilitating repairs and repair costs. Under some conditions it will be desirable to have a ily wheel 7 6 on the shaft 14, to carry the parts in continuing motion during the gear shifting time interval. The hydraulic actuation, however, is most rapid, and the transmission will not permit undesirable free wheeling.

From the foregoing it will be apparent that to place the transmission in any desired position, it is merely necessary to selectively valve the hydraulic pressure fluid into the appropriate cup by use ofthe hand lever.

Some changes may be made in the construction and 5. arrangement Qt mt trnsmiiga .Without departing, from the lreal spirit and p "eE Q invention, and"it"is'my` intentionito coli/fer 4by 4my" :lfairns, any rn'odiiied::forms` of structureV or use of mechani l" Vquiyalents which may reasonbly'includdwithin their scope.v

I claim:

l. In a transmission, a housing, a drive shaft rotatably mounted:y in; said ihous'ingf :la AJdriven "shaft rotatably mounted in said'ihousing,` a plurality/of gear wheels of different dimensions rotatably mountedl on said drive shft,"a rri'eans"`atne sid'eo'f' each"v said gear wheels ferlimiting the 'slidingrnvefrenreg l u p that direction, 'a 'eup membed'tnether side 'of 'each` of said gear wheels, a disk plunger slidably mounted in each of said cup members and capable of being moved into engagement with the gear wheel adjacent to it, a plurality of gear wheels of different diameters secured to said driven shaft and operatively in engagement with said plurality of gear wheels on said drive shaft, respectively, and a means for selectively furnishing hydraulic fiuid pressure to each of said cup members.

2. In a transmission, a housing, a drive shaft rotatably mounted in said housing, a driven shaft rotatably mounted in said housing, a plurality of gear wheels of different dimensions rotatably mounted on said drive shaft, a means at one side of each of saidgear wheels for limiting the sliding movement of said gear'wheels in that direction, a cup member on the other side of each of said gear wheels, a disk plunger slidably mounted in each of said cup members and capable of being moved into engagement with the gear wheel adjacent to it, a plurality of gear wheels of different diameters secured to` said driven shaft and operatively in engagement with said plurality of gear wheels on said drive shaft, respectively; said drive shaft having a bore, a hollow shaft slidably adjustably mounted in the bore of said drive shaft, passageways extending through the wall of said drive shaft communicating with the inside of said cup members, respectively, passageways extending through the wall of saidhollow slidable shaft capable of selectively comcunicating with the passageways inv said drive shaft, re-

spectively, a means for slidably moving said slidable` hollow shaft in said drive shaft, and a means for furnishing fluid pressure to the inside of said slidable hollow shaft.

dimensions rotatably mounted on said drive shaft, a

means at one side of each said gear wheels for limiting the sliding movement of said gear wheels in that direcl tion, a cupmember on the other side of each of said gear wheels, a disk plunger slidably mounted ineach of said cup members and capable of being moved into engagement with the gear wheel adjacent to it, a vplurality of gear wheels of different diameters secured to said driven shaft and operatively in engagement with said plurality of gear wheels on said drive shaft, respectively; said drive shaft having a bore, a hollow shaft slidably adjustably mounted in the bore of said drive shaft, passageways extending through the wall of said drive shaft communicating with the` inside of said cup members, respectively, passageways` extending through the wall of said hollow slidable shaft capable of selectively communicating with the passageways in said drive shaft, respectively, a means for slidably moving said slidable 'd gearl wheels in l plurality`of gear wheels oflditferent diameters secured to 4"said driveri shaft and operatively 'in' Yerlgagierrelt"with said plufality of fgearY whls on said "drive shaft, "respectivelyj'sidfdriye'shaft having" af'bore, a liolloiai shaft slidably yadjistalgly no'rn'ted'*" in `the boire "of `Saviddrive driveshaft communie members, "'respectivly; the Wall of said hollow slidable shaft capable of selective- 1y communicating with the passageways in said drive.

5. In a transmission, al housing, a drive shaft'rotatably mounted in said housing, a driven shaft rotatably mounted in said housing,a plurality` of gear wheels of different p .dimensions rotatably mounted on said drive shaft, a

means at one side of each of said gear wheels for limiting the sliding movement of said gear wheels in that direction, a cup member on the other side of each of said gear wheels, a disk plunger slidably mounted in 'each of said s cup members and capable of being moved into engagement with the gear wheel adjacent to it, `a plurality of gear wheels of different diameters secured to said driven shaft and operatively in engagement with said'plurality of gear wheels on said drive shaft, respectively; said drive shaft having a bore, a hollow shaft slidably adjustfr ably mounted in the bore of said drive shaft, passage ways extending through the wall of said drive shaft communicating with the inside of said cup members, respectively, passageways extending through the wall of said hollow slidable 'shaft capable of selectively communicating with the passageways lin said drive shaft, respectively, a means for slidably moving saidslidable hollow shaft in said drive shaft, and a fluid pump operatively connected to said drive shaft and inoperative corrmunication with the inside of said slidable hollow sha t.

6. In a transmission, a housing, a drive shaft rotatably mounted in said housing, a driven shaft` rotatably mounted in said housing, a plurality of gear Wheels of different dimensions rotatably mounted on said drive shaft, a means at one side of each of said gear wheels for limiting the sliding movement of said gear wheels l in that direction, a cup `member on the other side of each of said gear wheels, a disk plunger slidably mounted in each of said cup members and capable of being moved into engagement with the gear wheel adjacent to it, a plurality of gear wheels of different diameters secured to said driven shaft and operatively in engagement with said plurality of gear wheels on said drive shaft, respectively; said drive shaft having a bore, a hollow shaft slidably adjustably mounted n the bore of said drive shaft, passageways extending through the wall of said drive shaft comi 'y municating with the inside of said cup members, respechollow shaft in said drive shaft, friction plates on each tively, passageways extending through the wall of said hollow slidable shaft capable of selectively communicating `with the passageways in said drive shaft, respectively, a means for slidably moving said slidable hollow shaft in said drive shaft, a lever means for facilitating the slidable movement of said slidable shaft, and a fluid pump operatively connected to said drive shaft and in operative communication with the inside of said slidable hollow`v shaft.

` 7. In a transmission, a housing, a drive shaft rotatably mounted in said housing, a driven shaft rotatably passageways eiteiidihg through a momma-insa@ houingl'aj infamy o'figear wheels pf difftntdmenSQnS,rotatably mounted on said drive shaft,

a rigid platel rigidly secured 4toV the. said drive shaft at one-side of each-of said gear wheels for limiting the sliding movementof said. gear wheels in that direction, a I

hydraulic :pressure actuated unit having a movable member onthe other side of each of said gear wheels and each oft-said members of said unit capableof frictionahly engaging the gearwheelstyadjacent to it when actuated, a

meansl for selectively furnishing hydraulic Huid pressure 10 to eachof saidhydraulicpressure actuated units, and a plurality of'gear wheels of difffferent diameters on said References Cited in the tile of this patent UNITED STATES PATENTS 196,990 Enrico Aug 15, 1905 l 2,825,234 Papst Mar. 4, 1958 2,849,887 f Knowles` sept. 2, 195s 

